cc: Add a test that the IOSurface drawing path makes the right context calls.

cc/layers/io_surface_layer_impl.cc

Index: cc/layers/io_surface_layer_impl.cc
diff --git a/cc/layers/io_surface_layer_impl.cc b/cc/layers/io_surface_layer_impl.cc
index c5da815ce05576c0233578d9df1f388856d7fa67..b09ee332c9d56b89f3e4f93698a5f8a9ad461c14 100644
--- a/cc/layers/io_surface_layer_impl.cc
+++ b/cc/layers/io_surface_layer_impl.cc
@@ -81,22 +81,9 @@ void IOSurfaceLayerImpl::WillDraw(ResourceProvider* resource_provider) {
               io_surface_texture_id_);
     }
 
-    GLC(context3d, context3d->activeTexture(GL_TEXTURE0));

[jamesr, 2013/04/19 00:05:09]

what was the actual bug? this call?

[danakj, 2013/04/19 00:06:41]

mac context virtualization is the bug on TOT.

the bug I caused was doing bindTexture etc in resource provider with
GL_TEXTURE_2D target. Bo fixed that last night.

[danakj, 2013/04/19 00:07:05]

I think this call is just redundant cuz we're always in this state when we leave
the renderer - please correct me if I'm wrong.

     GLC(context3d,
         context3d->bindTexture(GL_TEXTURE_RECTANGLE_ARB,
                                io_surface_texture_id_));
-    GLC(context3d,
-        context3d->texParameteri(
-            GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
-    GLC(context3d,
-        context3d->texParameteri(
-            GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
-    GLC(context3d,
-        context3d->texParameteri(
-            GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
-    GLC(context3d,
-        context3d->texParameteri(
-            GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
     context3d->texImageIOSurface2DCHROMIUM(GL_TEXTURE_RECTANGLE_ARB,
                                            io_surface_size_.width(),
                                            io_surface_size_.height(),